Search for applicable
aerial photographs: Millions of aerial photographs have been taken,
some as early as the 1930s. Sources
include private aerial survey firms, university map and image libraries,
engineering firms, local and state government and utilities.

Preparation of supporting
graphics: Aerial photograph enlargements and other supporting graphics,
such as annotated maps and images, are needed to explain the detail
analyzed on the photographs and conclusions that are reached regarding
ground activity. These materials are presented at depositions, hearings
and trials.